The pion at finite temperature and density
We review the lowtemperature variation in the pion mass with temperature. This dependence follows from explicit chiral symmetry breaking and can be calculated in terms of pionic interactions. We then show that the standard calculation of the density dependence of the pion mass gives only a small in... Ausführliche Beschreibung
1. Person:  Brown, G.E. 

Weitere Personen:  Koch, V.; Rho, M. 
Quelle: 
in Nuclear Physics, Section A Vol. 535, No. 34 (1991), p. 701714 Weitere Artikel 
Format:  OnlineArtikel 
Sprache:  English 
Veröffentlicht: 
1991 
Beschreibung:  OnlineRessource 
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Copyright: Copyright (c) 2002 Elsevier Science B.V. 
Zusammenfassung: 
We review the lowtemperature variation in the pion mass with temperature. This dependence follows from explicit chiral symmetry breaking and can be calculated in terms of pionic interactions. We then show that the standard calculation of the density dependence of the pion mass gives only a small increase in this mass with increasing density. Explicit chiral symmetry breaking, which produces the bare quark masses, arises at a much higher mass scale than that of QCD. The bare quark masses are then magnified by the quark condensate to produce the much larger pion mass. This magnification disappears as the quark condensate ''melts'', bringing the pion mass essentially to zero at a density =<2"0, where "0 is the nuclear matter density. In the region of nuclear matter density "0, m"π^*/m"π may even be somewhat smaller than m"N^*/m"N. Arguments are given that the nucleon mass, and masses of mesons made up out of upanddown quarks should change much more rapidly with density than with temperature, at least for moderate changes in each. We suggest that the decreasing pion mass, while not effective in pionnuclear processes at zero temperature, should play an important role in heavyion collisions. 

ISSN: 
03759474 